Improvement in bolt-cutters



l'tnitell giedre 'latent @twine Letterslatent N 107,438, dated September 20, 1870.

IMIPROVElMlElNT IN BOLT-CUTTERS.

The Schedule referred to in these Letters Patent'and making part 0f the Sam? To` allpersons to whom thse presents may come .Y Be it known' that I, JAMEs"R.BROivN,.of Gainbi'idgeport, of' the county of Middlesex and St-ate of Massachusetts, have inyentetl a new anduseful or improvedBoltCutter; and d o'hereby declare the same to" be fully 'described -in the following'specitication and represented inthe accompanying drawing, of whichl 'l .Figure lis a side-elevation, and

Figures' 2 and 3 are longitudinal sections lof the said bolt-cutter. In such drawing- A denotes a cutter-head or yoke, provided with a stationary knife or cutter, (t, and a movable orsliding one, l), the said head, with its cutter, heilig shaped and arranged in manner as represented. The inovablecutter is fixed in `a carrier or slides, lengthwise therein, and is held thereto by a double screw,"0, or two screws, e d, of different diameters and pitches, that is, they-are differential screws. The larger screw screwsinto the carrier, and the smaller one into the movable cutter, the whole being so that, by revolving the double-screw U in one direction, the

cutter b may be moved toward the cutter e. 'Thepurpose of the screw is to advance 'the cutter in. proportion as it or the stationary cutter maybecome worn.

` Two toothed racks or ranges, c e, of teeth are disposed invopposite sides ot' the carrier B, and engage with sectoral gears', arcs', or ranges of teeth, d d', formed on the-ends of two levers, D D, which are pivoted to 4the head A, the pivots or fulcra of such levers being shown at gg.

"By moving the longer arms of the leversapart, the cutter b will be retracted, and, by forcing the said arinstoward each other, the said' cutterl will he advanced or moved toward the cutter a..

' By applying the machine to a bolt, by inserting the holt between the cutters, and forcing the movable one up to the stationary one, the bolt maybe cnt off close upto'it's nut, after the latter may have been screwed up.- n By moving the levers apart far enough to disengage the toothed sectors and racks, the cutter-carrier B, with its cutter, may be readily drawn out of the frame A, for -the purpose of being sharpened.

lI am aware'ofv the bolt-cutter of Johnson, as described in the United States Patent No. 65,391. I am also aware of the bolt-cutter ofllendiatn, as represented in the United States Patent No. 102,026.

My bolt-cutter dilers from each of these latter, in be.-

ing so construetedas to enable its part B, with the cutter b, to he readily withdrawn from the frame A,

when the levers D D are moved apart, so as to dis# engage the toothed sectors and racks, such being Qyery important, as it saves the necessity of first disengagf ingI either orhoth the levers from the frame, preparatory to a withdrawal of thel cutter and its carrier` therefrom, for the purpose of sharpening the latter,

as occasion may require.

' The upper part oi' the carrier'B, or that part prof j'ectingbeyond the racks, is made of a width no greater than the distance between the bases of the teeth ot" the opposite racks, there being beyond the two racks no projection from the part B to so come incontact with the levers, 'when-thrown up, to disengage the sectors and racks, as to prevent the withdrawal of the part B from between the levers, and from the.

frame A.. v

Furthermore, lny bolt-cutter dil'ers from that. of Mendhain in having the combined screws G Q to con`- neet the 'parts B and l), whereby the part or cutter b may be adjusted or moved baclc'and forth by the twov Screws, the adj listing-screw of Mendhams bolt-cutter operating to move the eut-ter in one direction only, and requiring a clamp-screw to hold the cutter'to its carrier,

I therefore claim- 1. lhe particular construction,l and the ,arrange-v ment relative to one another, ot' the toothed sectors d and cutter-carrier 1;,i1 virtue of which the said carrier, together with the cutte1,1nay be readily with- .v drawn from the frame A, 011 turning the handles D 1) around far enough to disengage thc teeth of the see-l 

